But this time my ds is at nursery full time, so it's a big different. Ds is only 20 months, so although quite young he showed all signs of being ready, biggest sign, was bringing a potty full of wee all the way down the hall to the kitchen to show us! So I thought he's ready. 
With all my other dc I've not really found it very hard, mastered in a couple if days. Except for ds1 who was horrendous! But that was 13 years ago. The weekend was fine 4 wees in Saturday, 4 on Sunday. He can say wee wee and potty and knows exactly what to do, but its gone a bit wrong this week at nursery. They had him in pull ups o. Monday, clearly he thought this a nappy, so definitely didn't help. Tues and wed he's just been in proper pants. Tues although say on potty wouldn't do anything. Wednesday they managed to get 1. At home in the eve he's happy to sit, does a drip, then holds it tightly so he doesn't go. He's clearly got a lot of control. But instead of doing the one big wee, will let it come out a few drips at a time. So lots of accidents.
Have I embarked on this too soon? Or should I just pull him out of nursery for a week and do it myself? I don't want to put him back in nappies now as I think he may switch off to it, like ds one did.